Utilizing catheters with unchangeable distal tip, traditional endovascular minimally invasive surgery is manually performed by surgeons present in an operating room filled with X-ray radiation. It has many disadvantag...
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An electro-hydraulic shaking table (EHST) is used for real-time replication of situations that occur in civil and architectural engineering, the automotive industry, and earthquake resistance testing. EHSTs are able t...
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In this paper, we introduce a quadruped robot designed for bounding gait with only one actuator per compliant leg. Under the analysis of the dynamics model of the robot, a new simple linear running controller using th...
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In this paper, we introduce a quadruped robot designed for bounding gait with only one actuator per compliant leg. Under the analysis of the dynamics model of the robot, a new simple linear running controller using the energy control idea, which requires minimal task level feedback and only controls both the leg torque and ending impact angle, is proposed. It successfully executes fast running from rest till a constant speed and hi-speed turning, both in the prototype simulation and robot experiment. These results contribute to that complex dynamically dexterous tasks may be controlled via simple energy control method and delayed task feedback, which is closer to the animal’s actual locomotion conditions. In the future, we plan to modify this method for reducing the energy expending and make the robot running fast.
Quadruped robot has great potential in traversing irregular terrains. Normally its performance relies greatly on the accuracy of local terrain data that the onboard sensor system acquired. In order to reduce its relia...
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Quadruped robot has great potential in traversing irregular terrains. Normally its performance relies greatly on the accuracy of local terrain data that the onboard sensor system acquired. In order to reduce its reliance on terrain information for locomotion control to the minimum, in this paper we intend to provide a method to intensify its walking adaptability by endowing the robot with blind walking ability. Based on the transfer strategies provided in the paper, the rough terrain walking problem could be simplified as common slope walking condition, and motion planning could be achieved via some basic criteria. Impedance control is implemented to reduce impact when foot stride to ground. On purpose of coping with foot slippage which would cause robot to fall, reflex control strategy is applied and tested. Via simulation we tested the control strategy and the feasibility was verified.
In this work, a quadruped robot designed for trotting gait with compliant leg is proposed. Based on the Spring-Loaded Inverted Pendulum model (SLIP), simplified models of different degrees of freedom (DOF) of the robo...
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In this work, a quadruped robot designed for trotting gait with compliant leg is proposed. Based on the Spring-Loaded Inverted Pendulum model (SLIP), simplified models of different degrees of freedom (DOF) of the robot body are constructed. Under the analysis of the dynamics model, a simple running control method was implemented to decouple six DOF of the body, which requires minimal task level feedback and only controls the leg torque and touch down angle. In simulation this control method successfully executes on robot running from stationary to a constant speed when climbing up or down slope with well regulated pitching, rolling and yawing motions. Additionally, a prototype robot is constructed, and the control method is verified by prototype experiment in the sagittal plane.
To provide theoretical basis for metal honeycombs used as buffering and crashworthy structures,the effect of the cell length and foil thickness on compressive properties of metal honeycombs is investigated by numerica...
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To provide theoretical basis for metal honeycombs used as buffering and crashworthy structures,the effect of the cell length and foil thickness on compressive properties of metal honeycombs is investigated by numerical *** results are well consistent with the corresponding experimental *** numerical results show that metal honeycombs have cyclic buckling when loaded in out-of-plane *** thicker the foil is or the shorter the cell length is,the higher the plastic collapse stress is and the plastic collapse stress is much sensitive when cell length is *** numerical simulation used in this paper can well predict the crush *** and doubled foil portions of cell walls are also accounted in the FE *** results demonstrate that the method is effective which can be used in optimization design of buffers.
A kind of beam-like space deployable truss mast with square batten frames supported by four longerons and two diagonal cables cross laced per face is described.A simple method for deriving mechanics parameters of the ...
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A kind of beam-like space deployable truss mast with square batten frames supported by four longerons and two diagonal cables cross laced per face is described.A simple method for deriving mechanics parameters of the mast is *** loads for mast to maintain self-equilibrating structure are *** equations for the axial,bending,shear,torsional stiffness and bending strength of the mast are derived based on proposed *** derived by simple method are consistent with expressions for the effective continuum mechanics of beam-like truss derived previously based on equivalent continuum method,these equations are helpful for mast preliminary design and mechanics *** of mast structural parameters on mast stiffness and strength is analyzed,mast stiffness and strength can been improved by selecting reasonable structural parameters.
For getting good passive self-adaptability,the model for single wheel system contacting with the terrain is established,and the degree of freedom(DOF) needed is studied when the system has good passive self-adaptabili...
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For getting good passive self-adaptability,the model for single wheel system contacting with the terrain is established,and the degree of freedom(DOF) needed is studied when the system has good passive self-adaptability;further more,the model of one sided wheel-suspension is set up,and the DOF is obtained by analyzing with corresponding proof is given;several relative features of some common passive self-adaptive rovers are concluded,and these information testifies the universalism of this paper's conclusions.
The study of touchdown angle's impact on quadrupeds such as gait, stability, speed, height is valuable. This paper unifies two common models for quadrupeds-SLIP and planar model, gets a feasible and efficient fixe...
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The study of touchdown angle's impact on quadrupeds such as gait, stability, speed, height is valuable. This paper unifies two common models for quadrupeds-SLIP and planar model, gets a feasible and efficient fixed point search strategy, and proposes a gait classification method based on the event sequence. On this basis, we study the influence of touchdown angle on quadruped robot in a variety of energy levels, and find that the change of touchdown angle would cause cycle bifurcation and chaos phenomena. Meanwhile, we notice in certain energy level and reasonable parameters configuration, different touchdown angles mean different gaits and only change of touchdown angle can make gait transition. In a fixed energy level, the impact of touchdown angle on horizontal speed, apex height and pitch angle is not obvious, but for pitch angular velocity it has obvious effect, and we reveal the importance of pitch angle and related variables such as inertia, mass distribution for quadruped control. Under the meaning of stable fixed points, speed adjust by changing touchdown angle is of little effect; however energy control is a feasible method.
Gait signal analysis of quantitative has been a challenging task over the past decades for its non-linear and non-stationary nature. Empirical Mode Decomposition (EMD) is a data-driven signal analysis method developed...
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